Shares of Abeona Therapeutics (NASDAQ: ABEO) jumped 18.4% on Tuesday, while shares of Sangamo Therapeutics (NASDAQ: SGMO) ended up 11.3%. The former is clearly because Abeona received a “breakthrough therapy” (BT) designation from the U.S. Food and Drug Administration for its EB-101 gene therapy program, for patients with recessive dystrophic epidermolysis bullosa. Sangamo is developing gene therapies of its own, albeit for different diseases, so it may be riding on Abeona’s coattails.